They also provide a popular form of recreation, and have been adapted for use as children's toys, general fitness, military and police applications, courier services, bicycle racing, and bicycle stunts. They are the principal means of transportation in many regions. These numbers far exceed the number of cars, both in total and ranked by the number of individual models produced. A bicycle rider is called a cyclist, or bicyclist.īicycles were introduced in the 19th century in Europe, and by the early 21st century, more than 1 billion were in existence. A bicycle, also called a bike or cycle, is a human-powered or motor-powered, pedal-driven, single-track vehicle, having two wheels attached to a frame, one behind the other.
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